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QEMU Windows版是一套由Fabrice Bellard所编写的模拟处理器的自由软件，它与Bochs，PearPC近似，但其具有某些后两者所不具备的特性，如高速度及跨平台的特性。QEMU可以在任何支持的体系结构上运行任何计算机的操作系统，运行具有接近本机性能的KVM和Xen虚拟机。

功能介绍

QEMU有两种主要运作模倾：

User mode模拟模式，亦即是使用者模式。QEMU 能启动那些为不同中央处理器编译的Linux程序。而Wine及 Dosemu是其主要目标。

System mode模拟模式，亦即是系统模式。QEMU能模拟整个电脑系统，包括中央处理器及其他周边设备。它使得为系统源代码进行测试及除错工作变得容易。其亦能用来在一部主机上虚拟数部不同虚拟电脑。

QEMU的主体部份是在LGPL下发布的，而其系统模式模拟与kqemu加速器则是在GPL下发布。使用kqemu可使QEMU能模拟至接近实机速度，但其在虚拟的操作系统是Microsoft Windows 98或以下的情况下是无用的。

QEMU优点：

可以模拟 IA-32 (x86)个人电脑，AMD64个人电脑， MIPS R4000, 升阳的 SPARC sun3 与 PowerPC (PReP 及 Power Macintosh)架构

支持其他架构，不论在主机或虚拟系统上(请参看QEMU主页以获取完整的清单)

增加了模拟速度，某些程式甚至可以实时运行

可以在其他平台上运行Linux的程式

可以储存及还原运行状态(如运行中的程式)

可以虚拟网络卡

可模拟多CPU

更新内容

不兼容更改：

Option "-no-kvm-pit-reinjection" has been removed. Use "-global kvm-pit.lost_tick_policy=discard" instead.

Option "-no-kvm-irqchip" has been removed. Use "-machine kernel_irqchip=off" instead.

The "vlan" parameter of the "-net" option has been removed. Use "-netdev" with IDs or the "hubport" netdev instead.

The deprecated -drive options "geometry", "addr" and "serial" have been removed. Use "-drive if=none" and pass the options to "-device" instead.

The "xlnx-ep108" machine has been replaced by the "xlnx-zcu102" machine.

The qemu-img "convert -s snapshot_id_or_name" argument has been removed. Use "convert -l snapshot_param" instead.

PPC support for explicitly allocated RMAs has been removed (kernel support removed in 2015).

The default for VFIO's "display" option has been changed from "auto" to "off", because "auto" requires an OpenGL-compatible configuration for vGPUs that require GL support.

The deprecated xlnx-ep108 machine was removed.

Some 32-bit guests on the "virt" machine may need "-machine highmem=off" if they are unable to support LPAE and are confused by the PCI ECAM now being above the 4GB mark in the address space

已弃用选项和功能：

The "arch" output member of the "query-cpus-fast" command is deprecated. Use the "target" output member instead.

Option "-virtioconsole" is deprecated, use "-device virtconsole" instead.

The non-functional "-clock" option will be removed soon.

The "pc-0.10" and "pc-0.11" machines are now deprecated. Use newer machine types instead.

Option "-enable-hax" is deprecated. Use "-accel hax" instead.

The "arch" memeber in the reply to query-cpus-fast is deprecated, use "target" instead.

The "file" driver for drives is no longer appropriate for character or host devices and will only accept regular files (S_IFREG). Use host_cdrom or host_device instead.